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+error[E0375]: implementing the trait `CoerceUnsized` requires multiple coercions
+ --> $DIR/E0375.rs:10:12
+ |
+LL | impl<T, U> CoerceUnsized<Foo<U, T>> for Foo<T, U> {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ requires multiple coercions
+ |
+ = note: `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced
+ = note: currently, 2 fields need coercions: `b` (`T` to `U`), `c` (`U` to `T`)
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0375`.